black patches when rendering car animation..?

[thiyagu]

am working 3dsmax vray render using a car movements in the animation sequence but black patches appearing on the road surface,how to solve this problem.

[Corey Beaulieu]

What method are you using to render this? Is the camera moving or just the car?

 

If the camera is not moving I would render a High Res backplate using Irradiance Map+Light Cache without the car and then render the car alone with a matted scene with Brute Force+Light Cache. If you setup a multimatte you should be able to separate the car from its shado and then composite them together with any number of programs.

[thiyagu]

Both are moving in this scene(the camera as well as the car too), are there any possibilities to render both in single render sequence without any flickering and those black patches on the road? i guess i'm doing something wrong with the render setup and i really couldn't figure it out what's wrong.

i'm using irradiance maps with multiframe incre mode and light cache flythrough mode.

Are their any other way to render it out finely?.

[Scott Schroeder]

You can use IMAP + LC precalculated at every so many frames for your background scene, but the car has to be brute forced on it's own layer. Unless you want to brute force the entire scene if you don't want to comp them together.

 

The car is moving too quickly for proper imaps which is why it is leaving a trail of spots in its path.